Combined telephone transmitter and receiver.



PATE'NTBD OCT. 13, 41903;-

G.YEA0K.. IG0MBI1 \T1ZD TELEPHONE TRANSMITTER AND RECHNER. APPLICATION HLED MAR. 13; 1903. No MODEL.

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Y removed, and Fig. 3 is a plan viewof thevinv are binding-posts 4 5 for engaging Ythe wires slots 14 15, which loosely fit upon the screws and exact description.

poles are disposed in the position indicated UNITED STATES atented October 1.3, 1903.

4PATENT' OFFICE.,

l CHARLES YEAcK, or AKRON, cino.

SPECIFICATION forming partof Letters-Patent 190.741,604, dated @ci-.ober 13, 1903.

Application iiled March 13, 1903.

T all whom t may concern: g

Be it known that I, CHARLES YEACK, a citizen of the United States, and a resident of Akron, in the county of Summit and State of Ohio, have invented a new and Improved Combination TelephoneTransmitter and Receiver, of which the following is a full, clear,

Myinvention relates to telephony, my more' particular object being to produce a combination instrument which may be used as a transmitter or as a receiver and may alsobe used in other relations more or less analogons. e

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters'of reference indicate corresponding parts in all the ligures.-

Figure 1 is a central sectional view through the instrument upon the line 1 1 of Fig. 3 looking in the direction of the arrow. Fig. 2 is a plan view of the instrument with the top strument with the top in place. Y

Abase 1, made, preferably, of hard wood, is

provided with bolt-holes 2,through which pass bolts or screws 3. Mounted uponthe base 1 6 7. The top 8 is also similarly engaged by the bolts or screws 3, whereby it is held in place. Mounted upon the top 8 is a composite mouthpiece consisting of an inner annu!V lar member 9, upon'which is mounted an outer annular member 10, as indicated more particularly in Fig. 1. A pair of tongues 1l 11a are connected with the annular member 9 for the purpose of holding the same in position. A diaphragm 10a, made of magnetic material and capable of serving as an armature, is mounted between the annular members 910 and held in position by the rubber rings 12 13, thus being normally free to vibrate. The tongues 11 11a are providedwith 16 17, as indicated in Figs. 1 and 3. By means of packings 18 19 of rubber the member 9 is enabled to make a neat fit upon the top 8. Permanent magnets 20 2l are mounted within the base 1. These magnets are so disposed that like poles are presented toward each other. For instance, the south-seeking senti No. 1475632. (No man.)

The pole-piece is provided with a thread 25,"

which revolubly ts into the nut 26, this nut being normally stationary. A winding or' coil 27 of insulated wire is so disposed as to encircle the pole-piece 22as indicated more particularly inFig. 1. Upon the outer end of the magnets/.2O 2l, respectively, are mounted the coils or windings 28 29, which are disposed within apertures 30k 31 in the base 1 and top 8.` The binding-,postlis connected by means of a wire 32 with thewinding 29. From this winding a wire 33 leads to the winding 27, from whence a wire 34 leads to the winding 28, 'this winding 28 being connected by means of a wire to the bindingpost 5. The binding-posts 4 5 constitute the terminals of the instrument.

f The action of my device is as follows: When the instrument is used as a transmitter, the

sounds of the voice are impressed lupon the diaphragm l0, causing the same to vibrate after the manner of any magneto-transmitter. The twosimilar poles 'ofA the magnets 20 21 render the core 22 astatic, so that the polepiece 23 presents the same polarity as the magnet-poles S S immediately adjacent to the core 22. The vibration of the diaphragm 10? thus sets up weak alternating currents of varying intensity in the coil 27, and these currentsliiow through the coils 28 29, which the power of the permanent magnets 20 21 and cause the same to exert a variable astatic effect upon the core 22,augmenting the change in its magnetic condition-that is to say, the currents induced in the coil 27 by flowing through the coils 28 29, and thereby varying the strength of theV respective elds of the permanent magnets 2O 21, cause these IOO magnets to affect the core 22 and diaphragm lat so as to increase the amplitude of the vibration thereof beyond what it would be if it depended solely upon the mechanical vibrations of the voice. When the instrument is used as a receiver, the telephonie currents from a distance sim ultaneously energize the three coils shown and cause the cumulative effect of the three coils to manifest itself upon the diaphragm a. The eect of the coil 27 is immediate and is obvious. The effect of the coils 2S 29 is somewhat indirect, these coils affecting the lines of force of the permanent magnets 21 20, these magnets in turn affecting the astatic condition of the core 22, and this core directly affecting the diaphragm 10a. When used either as a transmitter or as a receiver, the currents produced in the several windings should be in phase with each other, and the windings should of course be of proper direction to attain this end rather than to cause the currents to destroy each other.

Aside from the purposes above mentioned the instrument may be used as a telegraphic sounder.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- In a combined transmitter and receiver, the combination. of a casing, bar-magnets mounted therein and provided with shoulders, said magnets being disposed in axial alinement with each other, windings mounted upon said magnets and engaging said shoulders, a revoluble core of magnetic material disposed between said magnets and rendered astatic thereby, said core being provided with a thread, windings for said core, connections for all of said windings, terminals for said connections, a diaphragm normally disposed adjacent to said core, and a threaded nut connected with said casing and engaged by said revoluble core, whereby the same may be adjusted relatively to said diaphragm.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES YEACK.

Witnesses:

L. I. JONES, J. I. BACHTEL. 

